<template>
    <el-container class="home-container">
      <!--头部-->
      <el-header>
        <div>
          <img src="~assets/image/heima.png" alt="">
          <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logout">退出</el-button>
      </el-header>
      <!--主体-->
      <el-container>
        <!--左侧-->
        <el-aside :width="isCollapse ? '64px' : '200px'">
          <!--侧边栏菜单区域-->
          <div class="toggle-button" @click="toggleCollapse" >|||</div>
          <el-menu
              background-color="#333744"
              text-color="#fff"
              active-text-color="#409EFF"
              unique-opened
              :collapse = "isCollapse"
              :collapse-transition = 'false'
              router
              :default-active="activePath">
            <!--一级菜单-->
            <!--index后面只允许有字符串类型的数据 加空引号将数字转换为字符串-->
            <el-submenu :index="item.id + ''" v-for="(item , index) in menuLIst" :key="item.id">
              <template slot="title">
                <!--图标-->
                <i :class="iconsList[item.id]"></i>
                <span>{{ item.authName }}</span>
              </template>
              <!--二级菜单-->
              <el-menu-item
                  :index="'/' + subItem.path"
                  v-for="subItem in item.children"
                  :key="subItem.id"
                  @click="saveNavState('/' + subItem.path)">
                <template slot="title">
                  <i class="el-icon-menu"></i>
                  <span>{{subItem.authName}}</span>
                </template>
              </el-menu-item>
            </el-submenu>
          </el-menu>
        </el-aside>
        <!--右侧-->
        <el-main>
          <router-view></router-view>
        </el-main>
      </el-container>
    </el-container>
</template>

<script>
export default {
  name: "Home",
  data() {
    return {
      menuLIst: [],
      iconsList: {
        125: 'iconfont icon-users',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao',
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的连接地址
      activePath: '',
    }
  },

  created() {
    this.getMenuList();
    this.activePath = window.sessionStorage.getItem('activePath')
  },

  methods: {
    logout() {
      // 清空token返回到登录页面
      window.sessionStorage.clear();
      this.$router.push('/login');
    },
    // 获取所有菜单的请求
    async getMenuList() {
      const {data: res} = await this.$http.get('menus');
      // console.log(res)
      if(res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.menuLIst = res.data;
    },
    toggleCollapse() {
      this.isCollapse = !this.isCollapse;
    },
    saveNavState(activePath) {
      // 此处必须是键值对
      window.sessionStorage.setItem('activePath' , activePath);
      this.activePath = activePath;
    }
  }
}
</script>

<style scoped lang="less">
.el-container {
  height: 100%;
}

.el-header {
  display: flex;
  justify-content: space-between;
  background-color: #373d41;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  .el-menu {
    border-right: none;
  }
}

.el-main {
  background-color: #eaedf1;
}

.home-container {
  height: 100%;
}

.iconfont {
  margin-right: 10px;
}
.toggle-button {
  background-color: #4A5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.3em;
  cursor: pointer;
}
</style>